[2] He left Italy for France on 13 December 1931 due to the increase of the Fascist rule's oppression and settled in Toulouse.

[1] After the end of the Fascist rule, Ferrari was elected as a deputy from the Communist Party to the Constituent Assembly on 2 June 1946.

[1] Ferrari directed the consortium of development of the province of Parma and was involved in constructing the Cisa motorway.

One of his sons was a medical doctor and was killed in a Nazi-fascist ambush in Ponte di Lugagnano on 20 November 1944.

[7] Another book was published in 2022 entitled L' ingegnere delle barricate: Autobiografia di Giacomo Ferrari il nobile rivoluzionari (Italian: The engineer of the barricades.

Autobiography of Giacomo Ferrari the noble revolutionary) (ISBN 9788890852428) which features articles about his struggle against Fascists in Parma in 1922.